The newest 5 of 5 written questions. Open one to see it on the real paper.
C,H, is butene. Complete Figure 8.1 to show the displayed formula for but-1-ene. Figure 8.1
See it on the paper →Methane is the main constituent of natural gas. Natural gas is a fossil fuel. State the name of one other fossil fuel.
See it on the paper →Complete the dot-and-cross diagram in Fig. 6.1 to show the arrangement of electrons in a molecule of water. Draw the outer-shell electrons only. H O H
See it on the paper →Methane is the main constituent of a fossil fuel. State the name of this fossil fuel.
See it on the paper →Petroleum is a fossil fuel. State the name of one other fossil fuel.
See it on the paper →A good number of candidates were able to draw the electronic structure correctly, with many more able to place two electrons correctly in one of the bonds. The placement of the electrons outside of the bond proved more challenging with many placing one or more around the hydrogen atoms. Some candidates expected the hydrogen atoms to have the same requirement of 8 electrons in the outer shell that...
— Examiner report, May/June 2025, 0654/33 Q6(b)(iii) (Cambridge)
Some candidates knew that methane is the main constituent of natural gas. Other candidates suggested gas or coal.
— Examiner report, February/March 2024, 0654/32 Q8(a)(i) (Cambridge)
Few candidates were able to name another fossil fuel. Some candidates referred to crude oil, suggesting that the candidates did not know that crude oil is also called petroleum.
— Examiner report, May/June 2023, 0654/33 Q8(a)(i) (Cambridge)
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